On a MacPro4,1 with two CPUs and an ATI4870 graphics card, none of the ubuntu cds boots correctly. With the latest 10.04 releases (server and desktop) some boot messages appear on screen, but after some USB initialisations everything halts.
9.04 does not even start loading the kernel. Up to now I tried the 32bit variants.
Has anybody here gotten a similar configuration to work, I am talking about a MacPro not a MacBook Pro.